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Schweitzer Engineering Laboratories SEL-351A Protection System
Manufacturer: Schweitzer Engineering Laboratories
Condition: Brand New
Lead Time: In Stock
Origin: United States
Warranty: 12 Months
Email: [email protected]
whatsApp: +86-18150117685
- Overview
- Product Overview
- Key Functions
- Official Specifications
- Frequently Asked Questions
- Compatibility & Ordering Notes
- Hot Selling Models
- Recommended Products
Overview
SEL • SEL-351A
SEL-351A Protection System
The SEL-351A protection system combines directional overcurrent elements, feeder reclosing, fault location, metering, event recording, Ethernet communications and IEEE C37.118 synchrophasors.
At a Glance
| Brand | SEL |
|---|---|
| Model | SEL-351A |
| Product Type | Feeder protection relay |
| Core Function | Provides primary or backup directional overcurrent protection and feeder automation |
| Application or Compatible Series | Utility and industrial distribution feeders |
Exact Identification
Match SEL-351A character by character and confirm the complete Protection System designation.
Interface Arrangement
Confirm the installed supply, ports, field connections and required accessories before wiring the replacement.
Configuration Check
Preserve the approved engineering project, network parameters and application data used by the installed system.
Product Overview
The SEL-351A protection system combines directional overcurrent elements, feeder reclosing, fault location, metering, event recording, Ethernet communications and IEEE C37.118 synchrophasors.
Phase, negative-sequence, residual and neutral overcurrent elements work with four-shot reclosing and synchronism-check logic. The relay records events, locates faults, meters power and energy, and monitors breaker operating time and wear. Built-in Ethernet, serial ports and supported automation protocols connect the relay to SCADA, engineering and synchrophasor systems.
Key Functions
Feeder Protection and Reclosing
Phase, negative-sequence, residual and neutral overcurrent elements work with four-shot reclosing and synchronism-check logic.
Fault and Asset Monitoring
The relay records events, locates faults, meters power and energy, and monitors breaker operating time and wear.
Substation Communications
Built-in Ethernet, serial ports and supported automation protocols connect the relay to SCADA, engineering and synchrophasor systems.
Official Specifications
| Phase Current Inputs | IA, IB and IC: 5 A or 1 A nominal |
|---|---|
| Neutral Current Input | 5 A, 1 A, 0.2 A or 0.05 A nominal |
| AC Voltage Input Limit | 300 V maximum |
| Standard Contact Rating | 30 A make; 6 A continuous at 70 °C; 0.20 to 0.75 A breaking |
| High-Current Contact Rating | 30 A make; 6 A continuous at 70 °C; 10 A breaking |
| System Frequency and Phase Rotation | 50 or 60 Hz; ABC or ACB |
| Local and Serial Ports | 3 x EIA-232, USB Type B and EIA-485 |
| Ethernet Options | Dual 10/100BASE-T copper or single/dual 100BASE-FX fiber |
| Communication Protocols | SEL, optional IEC 61850, Modbus, DNP3, ASCII, SNTP, IEEE C37.118, FTP, Telnet and optional PRP |
| Synchrophasor Rate | Up to 60 messages/s at 60 Hz or 50 messages/s at 50 Hz |
| AC Sampling | 128 samples per cycle with a 3 kHz low-pass filter |
| Protection Processing | 4 times per power-system cycle |
| Power-Supply Options | 125/250 V DC or 120/230 V AC; 48/125 V DC or 120 V AC; 24/48 V DC |
| Operating Temperature | -40 to +85 °C |
| Harmonic Metering | Through the 16th harmonic |
| Automatic Reclosing | Up to four shots with two selectable reclose formats |
| Frequency Elements | Six frequency levels and four rate-of-change-of-frequency elements |
Frequently Asked Questions
Can SEL-351A protect a distribution feeder as the primary relay?
The relay provides primary or backup overcurrent protection for distribution feeders.
Which current-transformer secondary ratings can SEL-351A accept?
The phase inputs accept 5 A or 1 A nominal secondaries, while the neutral input also offers 0.2 A and 0.05 A options.
How many automatic reclose shots can SEL-351A perform?
The reclosing logic supports as many as four shots with two selectable formats.
Can SEL-351A publish synchrophasor measurements?
The built-in IEEE C37.118 function sends up to 60 messages per second on a 60 Hz system.
Which software is used to manage settings in SEL-351A?
acSELerator QuickSet SEL-5030 software is used to create and manage relay settings.
How does SEL-351A help maintenance teams assess breaker condition?
Breaker monitoring records recent trip and close times and retains trending data for up to 128 operations.
Can SEL-351A communicate over redundant Ethernet networks?
Optional Parallel Redundancy Protocol sends duplicate messages through two compatible Ethernet ports without packet loss after a single network failure.
Compatibility & Ordering Notes
Compatibility Checklist
- Select phase and neutral current-input ratings that match the installed instrument transformers.
- Retain the approved protection settings, SELogic equations, communications map and time source.
- Confirm whether IEC 61850, fiber Ethernet, PRP, SafeLock and sensitive-earth-fault options are required.
